Good point, pinkbunkadoo. Still, I think more people should be complaining at Wacom's forum as we both have already done. Don't get me wrong, I have also done the same reasoning as you, and yes, I have the feeling that Adobe could fix this, because it's clear that this lag is triggered by something they've changed in the latest versions, as you say.
But it's not too rare that driver developers "cut corners" (or just do wrong things) in their programming, and this weaknesses remain invisible until some program introduces some change or pushes the envelope, and this change triggers the bug in a poorly coded driver. And, if I were to choose, I would take a Photoshop engineer/programmer over a Wacom one any day. I'm sure Wacom staff are also talented people doing their best, but for whatever reason, they (Wacom) have been releasing really really bad and buggy drivers for the last few years, and that's a fact I can't ignore.
But the reason why I think Wacom is more likely to blame, is that Adobe did gave an answer - I don't know if it's the right answer, but they said: "There really isn't a context switch. The OS feeds events to Photoshop, and some of them have tablet info, while others don't. What you're describing is more of a tablet driver problem. ". Okay. What about Wacom? What have they said? Nothing. Well, maybe they answered something like "delete your prefs" or just generic performance tweaks that have nothing to do with this problem. Nothing else. They have been ignoring complaints about this issue for months now. I even asked them to confirm at least whether they could replicate the bug or not, as simple as that. Again there was no answer, and this stands out strikingly in a forum where they read and answer each and every post. It's a bit suspicious.
On the other hand, let's not forget that the lag goes away if we terminate the driver process. So, it might indeed be something Photoshop is doing, but the lag seems to originate from the tablet driver.
Anyway, I'm not sure at all about whose fault is it. There's no way I can tell for sure. I'm just sharing my thoughts about the issue and acknowledging the validity of yours. In fact, I also admit that it's a bit weird that this is only happening in PS CC (at least for me). I don't know what to think anymore.
Last but not least, on a related note, I insist on something I already said: it's strange that there aren't more people complaining. Maybe this is not 100% an Adobe/Wacom thing, and there's some other hardware or software involved. But I have replicated the bug in different computers with different software and hardware, so I'm at a loss trying to find a common pattern.
All in all, as I said, I've lost hope. I wish I am wrong....
(Btw, I'm still looking into huion tablets, but I think they don't work in mouse mode in PC, and I work in mouse mode, so I'm afraid they are a no-go for me....)
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